Nickola,
Meraki equipment all have local configurations that operate independent of the Meraki Cloud. The cloud stores the configuration and reflects changes from the dashboard down to the device.
If you factory reset a device, you can connect it back up the the network and it will download the latest configuration from the cloud. If a device dies, and you replace it with a new device of the same model, once added to the dashboard, it will download the latest configuration.
I would call that evidence of configuration backup from a device perspective.
Dave Anderson